Blowpipe



G. H. ZOUCK AND G. L. WALKER.

BLOWPIPE.

APPLICATION FILED APR. 18. 1919.

Patented May 3, 1921.

INVENTORS 6Z0 3 ffZbuc/f M ATTORNEYS was P -Aren't, orrice.

GEORGE E. ZOUCK, OF ORANGE, NEW JERSEY, AND GEORGE L. WALKER, NEW YORK, N. Y., ASSIGNORS TO AIR REDUCTION COMPANY, INC-, A CORPORATION OF NEW YORK.

' BLowmrE.

Specification of Letters Patent. Pat nt d M 3 1921.

Application filed April 18, 1919. Serial No. 291,105.

To all whomit may concern:

Be it known that we, GEORGE H. ZOUCK and GEORGE L. WALKER, both citizens of the United States, and residing at. Orange, Es- 'sexcounty, New Jersey, and New York c1ty,

- county and State of New York, respectively,

have invented certain new and useful Improvements in Blowpipes; and we do hereby of the tip.

A further object of the invention is the preservation of the controlling grooves or depressions whereby the proportioning of the mixture is regulated in blowpipes of the character illustrated in the patents to George Zouck issuedJuly 15,1919, No. 1,310,100

I Fig. 1

' .pipe construction is to provide eiiicient mix-' and No; 1,310,101;

Further objects and advantages of our invention willbe apparent as it is better understood by reference to the. following specification when read inconnection with the accompanying drawing in which;

Figure 1 isa longitudinal section through a blowpipe head and tip embodying our in vention;

Fig. 2 is a section-on the l1ne 2-2 of Fig. 3 1s a rear end view of the tip;

Fig. 4 is a section similar to Fig 1 illustrating a' slightly different form of our invention; and V Fig. 5 is a'rear end elevation of the t1p shown in Fig. 4. One of the problems presented 1n blowing of the combustible and oxidizing gases. Another is to overcome the tendency of the mixture to flashback and burn within the tip or head of the blowpipe.

We have discovered that the difficulties experienced in securing proper mixing and overcoming flashbackhmay be successinto an enlarged discharge passage which is preferably of uniform diameter throughout its length. The expansion of the gases into this dlscharge passage after passing the more restricted passage results in a thorough adm1 xtu re of the gases.- Furthermore the relatively high velocity of the gases issuing from the restricted passage prevents flame propagation through the mixtureand consequently overcomes the tendency to flashback Blowpipe tips are generally constructed of copper or an alloy in which copper predominates and are, therefore, relatively soft. In blowpipes employing grooves or depressions in the rear end of the tip to convey one of the gases to the other for the purpose.

of producing the combustible mixture, such grooves may be reduced in cross sectional area or otherwise distorted by the application of pressure while the tip is in a highlyheated condition. This diiiiculty may be readily overcome by the provision of an'inset of metal, having a higher resistance to deformation than copper, in which the grooves are formed and our invention contemplates the employment of such an inset. Obviously, however, the restricted passa e through which the mixture passes to t ,e discharge passage may be formed in an integral tip structure so that the advantages derived from the use of the restricted passage ai'e not limited to a construction involving the use of such an inset.

Referring to Figs. 1 and 3 of the draw-.

ing, 5 indicates the head of a blowpipe havmg passages 6 and 7 for oxidizing and combustible gases supplied thereto through pipes 8 and 9. The passage'6 terminates in a conical seat 10 and the passage 7 terminates in a channel 11 in the seat 10 surrounding the end ofthe passage 6. A tip 12 having a discharge passage 13 is secured to the head 5 by.a nut 14. At its rearward end the tip 12 is provided with. an inset 15 which is preferably threadedlymonnected to the tip as indicated at 16 although it may be otherwise secured'to the tip. The inset 15 is formed of a metal having a higher resistance to deformation than the metal of the tip which is usually copper or a metal in which copper predomlnates such as bronze. Various metals and alloys such as nickel, steel, etc., may be successfully employed and we do not desire to limit our invention to the use of any specific metal.

A passage 17 is formed in the inset15 alining with the discharge passage 13 and of somewhat smaller cross sectional area requiring the mixture to pass therethrough at a higher velocity and permitting expansion of the mixture upon entering the discharge passage. The inset15is provided with a conical recess conforming to the seat 10 and forming therewith a gas tight joint "surrounding the ends of the discharge passages in the head. Preferably a channel 18 is formed 'in'flie' face of the recess to register with the channel 11 when the tip is assembled with the head. The channel 18 is connected to the passage 17 by one or more grooves or depressions 19 through which the combustible I gas is conveyed to and mixed with the oxidizing gas as the latter issues from the passage 6 in the head. The grooves or depressions 19 being formed in the metal, having relatively higlr resistance to deformation, are not readily reduced in cross sectional area by the care-v less application 'of pressure when in a highly heated condition and the blowpipe cannot, therefore, be readily injured by abusive treatment to which it is sometimes subjected by careless workmen.- The restricted passage leading to the mixing and discharge passage insures ,proper mixture of the constituent gases and by requiring a high velocity at the entrance to th discharge passage, prevents flame-propagation rearwardly through the restricted passage.

slightly different form of our invention involving the same principles but in; which the inset 20 is limited to that portion only of the tip in which the restricted passage 20 leading to the discharge passage and the grooves or depressions 21 are formed. As will be readily understood the construction illustrated in Figs. 4 and 5 presents the same advantages as have been hereinbefore enumerated.

Obviously various changes may be made in the form, arrangement and construction of the blowpipe without de arting from the invention. For example, t e inset .may be of the same metal as the bodyof the tip and may be employed to facilitate the'manufacture' of a blowpipe having a restricted inlet to the discharge passage to improve mixing and prevent flashback. The inset may, moreover, constitute a larger portion of th tip and where only the protection of the grooves or depressions is desired the passage in the inset through which the mixture enters the discharge passage of the tip may be of the same or greater cross sectional area than the tip.

We claim: 1. In a blowpipe, the combination with a head having passages for oxidizing and combustible gases, of a tip having a 'discharge passage, and an inlet of smaller cross sectional area to said discharge passage, said head and tip having cooperating conical sealing surfaces. and a groove in one of said surfaces and terminating at the mouth of said inlet whereby gas is conveyed from one of the passages in said head and mixed.

with the gas from the other passage in said head at the mouth of said inlet.

2. In a blowpipe, the combination with a head having passages for oxidizing and combustible gases and a projecting conical seat, of a tip having a discharge passage, an inlet of smaller cross sectional area to said discharge passage, a conical recess conforming to said seat and forming therewith a combustible gases, a projecting conical seat and a channel in said seat communicating with one of said passages and'surroundlng .the other, of a tip having a-discha-rge passage, an inlet of smaller cross sectional area to said discharge passage, 'a conical recess conforming to said seat and forming therewith a gas tight joint and a-groove in the recessed surface'connecting said channel to said inlet when said tip is held in assembled relation with said head.

4.. In a blowpipe, the combination with a head having passages for oxidizing and.

combustible gases and a seat, of a tip having a discharge passage and an inset of metal havin a higher resistance to deformation than t e body of said tip, said inset having a surface cooperating with said seat to form a gas tight joint surrounding the ends of the passages in said head and'a.

groove in said surface whereby gas from one of the passages in said head is conveyed to and mixed with gas from another passage in said head at the inlet to said discharge passage.

6. In a blowpipe, the combination with a head having passages for oxidizing and combustible gases and a projecting conical seat, of a tip having a discharge passage and an inset of a metal having a higher resistance to deformation than the body of said tip, said inset having a conical surface cooperating with said seat and a groove in said surface whereby gas is conveyed from one of the passages in said head and mixed with gas issuing from another passage in said head at the inlet to said discharge passage. v

7. In a, blowpipe, the combination with a head having passages for oxidizing and combustible gases and a projecting conical seat, of a tip having a discharge passage and an inset of metal having a higher resistance to deformation than the body of said tip, said inset having a recessed surface cooperating with said seat to form a gas tight joint surrounding the ends of the passages in said head and a groove in said surface whereby gas is conveyed from one of the passages in said head and mixed with gas issuing from another passage in said head at the inlet to said discharge passage.

8. In a blowpipe, the combination with a head having passages for oxidizing and combustible gases, and a seat, of a tip having a discharge passage, an inset in said tip of metal having a higher resistance to deformation than the body of said tip, said inset being provided with an inlet of smaller cross sectional area to said discharge passage and a surface cooperating with said seat and having a groove whereby gas is conveyed from one of the passages in said head and mixed with gas issuing from the other passage at the mouth of said inlet.

In testimony whereof we afixour signatures.

GEORGE H. ZOUCK. GEORGE L. \VALKER. 

